When you have a RadVirtualGrid with hierarchy and after expanding a row if you right-click a cell in the child grid and select the "Copy" item, it doesn't copy the text of the cell I right-clicked, it copies the text of the first cell. 

Please test with the attached sample project.

I have a RadVirtualGrid with hierarchical data. When I change the page, then expand a row, and then hit the tab key I get an ArgumentOutOfRangeException:

Value of '-3838' is not valid for 'Value'. 'Value' must be between 'Minimum' and 'Maximum'.
Parameter name: Value

Please refer to the attached sample project and the gif file. You will notice that when resizing the grid, in certain cases unnecessary horizontal scrollbar appears.

When I use the Copy method in the RadGridView, the content is copied to the clipboard in multiple formats. Each format can be cancelled. If a format is cancelled it is not even serialized into the DataObject. This way a programmer can replace the copy-routine for that format with his own.

When I do the same with RadVirtualGrid, and I only want to copy format CSV and I want to cancel the rest, nothing is copied to the clipboard. The funny thing is, inspecting the code, the data is always serialized to the DataObject BEFORE the event is fired to find out if that action is needed. This is a performance penalty.

So these two behaviors are inconsistent. It is also inconsistent the the Paste-operations of both grids.

Current code:

public void CopyToClipboard(
      int startRow,
      int startColumn,
      int endRow,
      int endColumn,
      VirtualGridViewInfo viewInfo,
      bool selectedOnly,
      bool cut)
    {
      DataObject dataObject = new DataObject();
      string data1 = this.ProcessContent(DataFormats.Text, startRow, startColumn, endRow, endColumn, viewInfo, selectedOnly, cut);
      dataObject.SetData(DataFormats.UnicodeText, false, (object) data1);
      VirtualGridClipboardEventArgs args1 = new VirtualGridClipboardEventArgs(false, DataFormats.UnicodeText, dataObject, this.CurrentCell.ViewInfo);
      this.OnCopying(args1);
      if (args1.Cancel)
        return;
      dataObject.SetData(DataFormats.Text, false, (object) data1);
      VirtualGridClipboardEventArgs args2 = new VirtualGridClipboardEventArgs(false, DataFormats.Text, dataObject, this.CurrentCell.ViewInfo);
      this.OnCopying(args2);
      if (args2.Cancel)
        return;
      string data2 = this.ProcessContent(DataFormats.CommaSeparatedValue, startRow, startColumn, endRow, endColumn, viewInfo, selectedOnly, cut);
      dataObject.SetData(DataFormats.CommaSeparatedValue, false, (object) data2);
      VirtualGridClipboardEventArgs args3 = new VirtualGridClipboardEventArgs(false, DataFormats.CommaSeparatedValue, dataObject, this.CurrentCell.ViewInfo);
      this.OnCopying(args3);
      if (args3.Cancel)
        return;
      Clipboard.SetDataObject((object) dataObject);
    }

public void CopyToClipboard(
	int startRow,
	int startColumn,
	int endRow,
	int endColumn,
	VirtualGridViewInfo viewInfo,
	bool selectedOnly,
	bool cut)
{
	DataObject dataObject = new DataObject();

	VirtualGridClipboardEventArgs eventArgs = new VirtualGridClipboardEventArgs(false, DataFormats.UnicodeText, dataObject, CurrentCell.ViewInfo);
	OnCopying(eventArgs);
	bool useText = !eventArgs.Cancel;
	
	eventArgs = new VirtualGridClipboardEventArgs(false, DataFormats.UnicodeText, dataObject, CurrentCell.ViewInfo);
	OnCopying(eventArgs);
	bool useUnicodeText = !eventArgs.Cancel;

	if (useText || useUnicodeText)
	{
		string text = __instance.ProcessContent(DataFormats.Text, startRow, startColumn, endRow, endColumn, viewInfo, cut);
		if (useText)
			dataObject.SetData(DataFormats.Text, false, text);
		if (useUnicodeText)
			dataObject.SetData(DataFormats.UnicodeText, false, text);
	}
	eventArgs = new VirtualGridClipboardEventArgs(false, DataFormats.Text, dataObject, CurrentCell.ViewInfo);
	OnCopying(eventArgs);
	if (!eventArgs.Cancel)
	{
		string csv = __instance.ProcessContent(DataFormats.CommaSeparatedValue, startRow, startColumn, endRow, endColumn, viewInfo, selectedOnly, cut);
		dataObject.SetData(DataFormats.CommaSeparatedValue, false, csv);
	}
	
	if (dataObject.GetFormats().Length > 0)
		Clipboard.SetDataObject(dataObject);
}

When copying to from the RadVirtualGrid to the clipboard, the HTML format is not supported.

I was thinking about creating a feature request, but I really think this is a bug, because:

1. It is not consistent with its little brother RadGridView, which does support HTML.
2. HTML should be supported by Teleriks own documentation: https://docs.telerik.com/devtools/winforms/controls/virtualgrid/copy-paste-cut 

Please, implement the support for HTML.

Repro steps:

• Create a RadVirtualGrid
• Fill it with some records.
• Make sure nothing is selected (RadVirtualGridElement.CurrentCell is null)
• Press CTRL-C
• A NullReferenceException is thrown (this because RadVirtualGridElement.CopyToClipboard accesses CurrentCell.ViewInfo while CurrentCell is null.)

Exception:

Message             : Object reference not set to an instance of an object.
Type                : System.NullReferenceException
Source              : Telerik.WinControls.GridView
Stack trace         : Telerik.WinControls.UI.RadVirtualGridElement.CopyToClipboard(Int32 startRow, Int32 startColumn, Int32 endRow, Int32 endColumn, VirtualGridViewInfo viewInfo, Boolean selectedOnly, Boolean cut)
                      Telerik.WinControls.UI.RadVirtualGridElement.CopySelection()
                      Turien.Windows.Forms.Telerik.VirtualGrid.VirtualGridViewPlus.RadVirtualGridElementPlus.CopySelection()
                      Turien.Windows.Forms.Telerik.VirtualGrid.VirtualGridViewPlus.VirtualGridInputBehaviorPlus.HandleUnhandledKeys(KeyEventArgs keys)
                      Telerik.WinControls.UI.VirtualGridInputBehavior.HandleKeyDown(KeyEventArgs args)
                      Telerik.WinControls.UI.RadVirtualGrid.OnKeyDown(KeyEventArgs e)
                      System.Windows.Forms.Control.ProcessKeyEventArgs(Message& m)
                      System.Windows.Forms.Control.ProcessKeyMessage(Message& m)
                      System.Windows.Forms.Control.WmKeyChar(Message& m)
                      System.Windows.Forms.Control.WndProc(Message& m)
                      System.Windows.Forms.ScrollableControl.WndProc(Message& m)
                      Telerik.WinControls.RadControl.WndProc(Message& m)
                      System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
                      System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
                      System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
                      System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
                      System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
                      System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
                      System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
                      System.Windows.Forms.Application.Run(Form mainForm)
                      Turien.Schade.PremiumCalculator.LookupTableManager.Program.Main()

RadVirtualGrid.Selection.HasSelection (VirtualGridSelection.HasSelection) or is never false.

RadVirtualGrid grid = new RadVirtualGrid();
var hasSelection1 = grid.Selection.HasSelection; 
_grid.Selection.ClearSelection();
var hasSelection2 = grid.Selection.HasSelection;

After initializing the grid, and not loading anything, HasSelection is true, while nothing is selected.

After clearing the selection, HasSelection remains true.

This property is used in your own code as a pretest for some operations. (Like Copy or Cut).

Am I interpreting this property the wrong way?

Repro-steps

• Create a RadVirtualGrid en fill it with random data.
• Allow the grid to select multiple rows.
• Select all rows
• Right click on a cell, a context menu appears...
  

Observed behavior

First, lets compare this with when you right click on a record selector (the cell before a row starts, sometimes with an arrow). In that case only that row gets selected, so you visually see what the context menu is about. When you right click on a cell, the selection does not change so the context remains unclear. In my printscreen above it is hard to see on which cell I clicked.

Second, the actions in the context menu target multiple targets or contexts. Copy and Paste target the whole selection. Clear and Edit target the cell, Delete Row targets the row which I clicked on, but which is not visible. 

In this case, the user actually wanted to right click and delete ALL rows, which is not part of the context menu. Instead he clicked on Delete Row and he was unaware of what he had actually deleted.

Expected bevahior

• Or, when you right click on a cell, the cell gets highlighted, so you know where you have clicked
• Or, the rows gets highlighted (like your pressed on the record selector)
• Or, the cell gets highlighted
• And/or, the context menu offers an action to Delete All Rows.

Repro steps:

1. Create a RadVirtualGrid
2. Give it a DateTime column
3. Make sure the editor (VirtualGridDateTimeEditor) accepts dutch formats for dates (dd-MM-yyyy)
4. Add a row with value: 30-11-2023
   
   
5. Double click on the value and try to change it my literally typing: "31-12-2023"
   

Observed behavior:

• A field with the value 01-12-2023
  
  (this happens as soon as you type "31")
• The user needs to first enter the month, then the day to correct this.

Expected behavior:

• A field with the value: 31-12-2023

Observation / suggestion:

• The controle tries to validate and correct EVERY input, even when the input is not finished yet. Everybody knows "31-11-2023" is an incorrect value. But during changing it, this should not matter. The scope at that point should be: Making the user happy by accepting the input. When the user leaves the field, or enters the last digit, validation should take place. Or, if halfway entering the value, the totale date is invalid, do not change it and wait for the user to complete.

Right now, when a VirtualGridDateTimeEditor is displayed in a RadVirtualGrid, and the user chooses to enter the date (and not use the date time picker), then the user has to enter the date inclusing the separators.

So a Dutch date has format: "dd-MM-yyyy", and the user has to enter "31-12-2023", including the dashes.

Hereby my request for a new feature:  Entering dates without the separators / dashes, thus: "3112023". So at the moment the user enters two digits, move to the next segment, etc. The request goes for the time segments.

This would be a performance gain while doing a lot of data entry.

When the control is populated with hierarchy data, the current arrow icon and the expander icon overlap each other. This is observed when you click on a row.

As a workaround, we can increase the size of the indent column to leave enough space for both icons.

this.radVirtualGrid1.TableElement.IndentColumnWidth = 40;

Then we can move the current row arrow icon to the left (or right, depending on your requirement) in the CellFormatting event handler of the control.

private void radVirtualGrid1_CellFormatting(object sender, VirtualGridCellElementEventArgs e)
{
    if (e.CellElement is VirtualGridIndentCellElement)
    {
        var indentCell = e.CellElement as VirtualGridIndentCellElement;
        indentCell.ImageLayout = ImageLayout.None;
        indentCell.ImageAlignment = ContentAlignment.MiddleLeft;
    }
}

Currently, this behavior is available for RadGridView and the parent row becomes current/selected after expanding. Please refer to the attached gif file for RadGridView and the missing functionality for RadVirtualGrid.

The horizontal scrollbar should not appear on top of the data row.

Elements in the child grid that are outside of the parent bounds are not active. This means that you can't resize the column, edit, filter, sort or use any other build-in behavior.

In this case, we filter a column by typing in a filter cell. If we have a horizontal scroll move the filter cell out of the view and then go back to it and try to change the value of the filter cell, the editor has an empty string.