Completed
Last Updated: 07 Jun 2021 16:19 by ADMIN
Release R2 2021 SP1
If you add a RadCollapsiblePanel to a form in design time, then add some child controls in its control container, then open the Document Outline window, you will see that the child controls are not visible in the Document Outline.

Workaround: There is a workaround which involves creating an inherited RadCollapsiblePanel and assigning it with a custom designer:

[Designer(typeof(MyCollapsiblePanelDesigner))]
class MyCollapsiblePanel : RadCollapsiblePanel
{
    public override string ThemeClassName
    {
        get
        {
            return typeof(RadCollapsiblePanel).FullName;
        }
        set
        {
            base.ThemeClassName = value;
        }
    }
}
 
class MyCollapsiblePanelDesigner : RadControlDesignerLite
{
    public override void Initialize(System.ComponentModel.IComponent component)
    {
        base.Initialize(component);
 
        this.EnableDesignMode((this.Control as RadCollapsiblePanel).ControlsContainer, "ControlsContainer");
        this.EnableDesignMode((this.Control as RadCollapsiblePanel).PanelContainer, "PanelContainer");
    }
 
    public override ControlDesigner InternalControlDesigner(int internalControlIndex)
    {
        return this.DesignerHost.GetDesigner((this.Component as RadCollapsiblePanel).PanelContainer) as ControlDesigner;
    }
 
    public override int NumberOfInternalControlDesigners()
    {
        return 1;
    }
 
    protected override RadControlDesignerLiteActionList CreateActionList()
    {
        return new RadCollapsiblePanelActionList(this);
    }
}

Note that you would need to add references to the System.Design and Telerik.WinControls.UI.Design assemblies in order for the workaround to build. After you build it successfully, you can use the MyCollapsiblePanel component from your toolbox and you will be able to see the child controls in the document outline.
Completed
Last Updated: 23 Jan 2020 08:02 by ADMIN
Release R1 2019
To reproduce: please refer to the attached gif file:

1. Drop RadCollapsiblePanel from the toolbox on to the windows form.
2. Click on the form and press Ctrl+Z to undo the change
3. Observe that an error dialog popped up saying "Index and length must refer to a location within the string. Parameter name: length"
Completed
Last Updated: 06 Dec 2019 14:37 by ADMIN
Release R1 2020 (LIB 2019.3.1209)
To reproduce:

Add a RadLabel with text, set its background to red, its border to Yellow and start the project. You will notice that there is one pixel outside the border.

Workaround:

Set the Borderthickness of the LabelElement to 0: 

label2.LabelElement.BorderThickness = new Padding(0);
Completed
Last Updated: 06 Dec 2019 14:37 by ADMIN
Release R1 2020 (LIB 2019.3.1209)
Code to reproduce:
this.radLabel1.BackColor = Color.Yellow;
this.radLabel1.BorderVisible = true;
this.radLabel1.LabelElement.LabelBorder.ForeColor = Color.Red;

WORKAROUND:
this.radLabel1.LabelElement.LabelBorder.FitToSizeMode = RadFitToSizeMode.FitToParentBounds;
Completed
Last Updated: 12 Jun 2019 08:18 by ADMIN
Release R2 2019 SP1
To reproduce:
- Use the attached project.
- Resize the panel to the left.
- You will notice that the borders are cut off.

Second scenario: refer to the 1016234GridInCollapsiblePanelVS2010.zip
RadCollapsiblePanel1.ExpandDirection = Telerik.WinControls.UI.RadDirection.Right
RadSplitContainer1.SplitPanels("SplitPanel2").SizeInfo.SizeMode = Telerik.WinControls.UI.Docking.SplitPanelSizeMode.Absolute
RadSplitContainer1.SplitPanels("SplitPanel2").SizeInfo.AbsoluteSize = New System.Drawing.Size(637, 522)

Workaround: manually update the collapsible panel`s size in the SplitterMoved event
public WorkCenterScheduleAndStatusControl()
{
    InitializeComponent();

    this.radSplitContainer1.SplitterMoved += RadSplitContainer1_SplitterMoved;
}

private void RadSplitContainer1_SplitterMoved(object sender, SplitterEventArgs e)
{
    this.radCollapsiblePanel1.Size = new Size(this.radCollapsiblePanel1.Size.Width, this.radCollapsiblePanel1.Size.Height - 1);
    this.radCollapsiblePanel1.Size = new Size(this.radCollapsiblePanel1.Width, this.radCollapsiblePanel1.Size.Height + 1);
}

Completed
Last Updated: 12 Jun 2019 08:17 by ADMIN
Release R2 2019 SP1
To reproduce:
- Add to collapsible panels to a form.
- Dock the first to the top and set the Dock property of the second to Fill.
- Set the ExpandDirection of the second to Up.
- Start the application and collapse and then expand the second panel.
- You will notice that the header button is no longer visible.

Workaround:
void radCollapsiblePanel1_Expanded(object sender, EventArgs e)
{
    radCollapsiblePanel2.CollapsiblePanelElement.InvalidateMeasure(true);
}
Completed
Last Updated: 06 Jun 2019 13:31 by ADMIN
Release R2 2019 SP1 (LIB 2019.2.610)
How to reproduce: check the attached project

Workaround: resize the size of the hosting RadPanel
private void radCollapsiblePanel_Expanding(object sender, CancelEventArgs e)
{
    this.radPanel1.Size = new Size(this.radPanel1.Size.Width, this.radPanel1.Size.Height - 1);
}

private void radCollapsiblePanel_Expanded(object sender, EventArgs e)
{
    this.radPanel1.Size = new Size(this.radPanel1.Size.Width, this.radPanel1.Size.Height + 1);
}

Completed
Last Updated: 06 Jun 2019 13:30 by ADMIN
Release R2 2019 SP1 (LIB 2019.2.610)
To reproduce:
- Add a collapsible panel to ToolWindow.
- Collapse the panel and redock the tool window.
- The panel cannot be expanded any more.

Workaround:
List<Rectangle> list;
void radDock1_DockStateChanging(object sender, Telerik.WinControls.UI.Docking.DockStateChangingEventArgs e)
{
    list = new List<Rectangle>();
    foreach (var item in e.NewWindow.Controls)
    {
        if (item is RadCollapsiblePanel)
        {
            list.Add(((RadCollapsiblePanel)item).OwnerBoundsCache);
        }
    }
}

void radDock1_DockStateChanged(object sender, Telerik.WinControls.UI.Docking.DockWindowEventArgs e)
{
    int count = 0;
    foreach (var item in e.DockWindow.Controls)
    {
        if (item is RadCollapsiblePanel)
        {
            ((RadCollapsiblePanel)item).OwnerBoundsCache = list[count++];
        }
    }
}

Completed
Last Updated: 16 May 2019 08:54 by ADMIN
Release R1 2019
The fix in 3Q18 removed the exposed Text property of the RadPanel control.  Setting the text to blank should not have removed the Text property from the control. 
Declined
Last Updated: 08 Apr 2019 10:36 by ADMIN
Workaround: set UseCompatibleTextRendering to true.
Declined
Last Updated: 05 Feb 2019 16:46 by Fabrice

Hi,

We have an issue when using RightToLeft property of the RadCollapsiblePanel Control.

When the HeaderText ends with non-alphanumeric characters, on display, these characters are moved to the beginning of the title (possibly with a replacement of the closing characters in opening characters - such as the parenthesis).

I've attached a little sample of the issue.

Thanks for your help.

 

Regards

 

Fabrice MABIT

fmabit@proginov.com

Declined
Last Updated: 23 Oct 2018 10:21 by ADMIN
To reproduce:
1. Add a RadCollapsiblePanel and change the back color or border of the container via the Edit UI elements dialog.
2. Save the changes and run the project. You will notice that the style is reset and the changes are not preserved. 

Workaround: Customize the style at runtime. The following help article gives you information about the internal elements structure of the RadCollapsiblePanel: https://docs.telerik.com/devtools/winforms/panels-and-labels/collapsiblepanel/structure 
Declined
Last Updated: 11 Oct 2018 11:12 by erwin
Use attached to reproduce.

Workaround:

- Use RadForm it explicitly handles the controls scaling. 
- Make sure that the following of the user controls are set like this:

this.AutoScaleDimensions = new System.Drawing.SizeF(96F, 96F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Dpi;


Unplanned
Last Updated: 11 Sep 2018 11:49 by ADMIN
Declined
Last Updated: 24 Aug 2018 13:05 by ADMIN
Create a new TelerikWinForms project.
Add a collapsible panel.
Set the border colour via the "Edit UI Elements" button in the task menu, under BorderPrimitive.ForeColor.
The border will appear to change in design view, but will not change at runtime, with the appropriate line not being added to the form .Designer.cs file at all.
This was tested with the Windows 8 theme applied.
Workaround: 
((Telerik.WinControls.Primitives.BorderPrimitive)(this.radCollapsiblePanel1.ControlsContainer.GetChildAt(0).GetChildAt(1))).ForeColor = Color.White;
Completed
Last Updated: 06 Aug 2018 10:57 by Dimitar
Workaround: use CollapsiblePanelAnimationType.Reveal 
Unplanned
Last Updated: 25 Jun 2018 13:48 by ADMIN
My current theme is windows10.
In two images I demonstrate the problem.
Completed
Last Updated: 21 Jun 2018 14:41 by ADMIN
Use attached to reproduce.
- Open the form at design time, the border is correctly set to gray color.
- Start the application, the border changes to blue. 

Workaround:
radCollapsiblePanel1.ControlsContainer.PanelElement.Border.ForeColor = Color.FromArgb(171, 171, 171);

or
ThemeResolutionService.ApplicationThemeName = "Office2013Dark";
Unplanned
Last Updated: 20 Feb 2018 13:17 by ADMIN
Controls in RadPanel redraw slowly when changing the Enabled state of the panel.

Workaround:

private void radButton1_Click(object sender, EventArgs e)
{
    if (this.radPanel1.Enabled)
    {
        this.radPanel1.Enabled = false;
    }
    else
    {
        this.radPanel1.Visible = false;
        this.radPanel1.Enabled = true;
        this.radPanel1.Visible = true;
    }
} 
 
Unplanned
Last Updated: 31 Jan 2018 07:02 by ADMIN
The issue reproduces if the panels are collapsed before auto hiding the windows. When the window is later displayed the collapsed panels cannot be expanded. Check the attached video: 

Workaround:
Cache the old bounds.
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        
        this.radDock1.AutoHideWindowDisplaying += RadDock1_AutoHideWindowDisplaying;
        this.radDock1.AutoHideWindowDisplayed += RadDock1_AutoHideWindowDisplayed;
        this.radCollapsiblePanel1.PanelContainer.BackColor = Color.LightGreen;
    }

    Rectangle cache;
    private void RadDock1_AutoHideWindowDisplayed(object sender, DockWindowEventArgs e)
    {
        this.radCollapsiblePanel1.OwnerBoundsCache = this.cache;
    }

    private void RadDock1_AutoHideWindowDisplaying(object sender, Telerik.WinControls.UI.Docking.AutoHideWindowDisplayingEventArgs e)
    {
        this.cache = this.radCollapsiblePanel1.OwnerBoundsCache;
    }
}
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