To reproduce:
RadDock goRadDock = new RadDock();
public RadForm1()
{
    InitializeComponent();
   
    this.Load+=RadForm1_Load;
}
private void RadForm1_Load(object sender, System.EventArgs e)
{
    goRadDock.Dock = DockStyle.Fill;
    this.Controls.Add(goRadDock);

    Telerik.WinControls.UI.RadListView loPanorama = new RadListView();
    HostWindow loHost;
    //' Set Panorama Properties
    // loPanorama.BackColor = System.Drawing.Color.Transparent;
    loPanorama.Dock = System.Windows.Forms.DockStyle.Fill;
    loPanorama.Location = new System.Drawing.Point(0, 0);
    loPanorama.Margin = new System.Windows.Forms.Padding(0);
    loPanorama.Name = "Panorama";
    // loPanorama.ScrollBarThickness = 1;
    // loPanorama.ScrollingBackground = true;
    loPanorama.ShowGroups = true;
    loPanorama.Size = new System.Drawing.Size(787, 315);
    loHost = goRadDock.DockControl(loPanorama, Telerik.WinControls.UI.Docking.DockPosition.Left);
    loHost.Text = "Panorama";
    loHost.DockState = DockState.AutoHide;

    Telerik.WinControls.UI.RadPanorama loPanorama2 = new Telerik.WinControls.UI.RadPanorama();
    HostWindow loHost2;
    //' Set Panorama2 Properties
    // loPanorama2.BackColor = System.Drawing.Color.Transparent;
    loPanorama2.Dock = System.Windows.Forms.DockStyle.Fill;
    loPanorama2.Location = new System.Drawing.Point(0, 0);
    loPanorama2.Margin = new System.Windows.Forms.Padding(0);
    loPanorama2.Name = "Panorama2";
    loPanorama2.ScrollBarThickness = 1;
    loPanorama2.ScrollingBackground = true;
    loPanorama2.ShowGroups = true;
    loPanorama2.Size = new System.Drawing.Size(787, 315);
    loHost2 = goRadDock.DockControl(loPanorama2, Telerik.WinControls.UI.Docking.DockPosition.Left);
    loHost2.Text = "Panorama2";
    loHost2.DockState = DockState.AutoHide;

    Telerik.WinControls.UI.RadPanorama loPanorama3 = new Telerik.WinControls.UI.RadPanorama();
    HostWindow loHost3;
    //' Set Panorama2 Properties
    //  loPanorama3.BackColor = System.Drawing.Color.Transparent;
    loPanorama3.Dock = System.Windows.Forms.DockStyle.Fill;
    loPanorama3.Location = new System.Drawing.Point(0, 0);
    loPanorama3.Margin = new System.Windows.Forms.Padding(0);
    loPanorama3.Name = "Panorama3";
    loPanorama3.ScrollBarThickness = 1;
    loPanorama3.ScrollingBackground = true;
    loPanorama3.ShowGroups = true;
    loPanorama3.Size = new System.Drawing.Size(787, 315);
    loHost3 = goRadDock.DockControl(loPanorama3, Telerik.WinControls.UI.Docking.DockPosition.Left);
    loHost3.Text = "Panorama3";
    loHost3.DockState = DockState.AutoHide;

    Telerik.WinControls.UI.RadPanorama loPanorama4 = new Telerik.WinControls.UI.RadPanorama();
    HostWindow loHost4;
    //' Set Panorama2 Properties
    //  loPanorama4.BackColor = System.Drawing.Color.Transparent;
    loPanorama4.Dock = System.Windows.Forms.DockStyle.Fill;
    loPanorama4.Location = new System.Drawing.Point(0, 0);
    loPanorama4.Margin = new System.Windows.Forms.Padding(0);
    loPanorama4.Name = "Panorama4";
    loPanorama4.ScrollBarThickness = 1;
    loPanorama4.ScrollingBackground = true;
    loPanorama4.ShowGroups = true;
    loPanorama4.Size = new System.Drawing.Size(787, 315);
    loHost4 = goRadDock.DockControl(loPanorama4, Telerik.WinControls.UI.Docking.DockPosition.Left);
    loHost4.Text = "Panorama4";
    loHost4.DockState = DockState.AutoHide;
}

Workaround:
RadDock goRadDock = new RadDock();

public RadForm1()
{
    InitializeComponent();

    goRadDock.BeginInit();
    goRadDock.Dock = DockStyle.Fill;
    this.Controls.Add(goRadDock);

    RadPanorama loPanorama = new RadPanorama();
    HostWindow loHost;

    loPanorama.Dock = System.Windows.Forms.DockStyle.Fill;
    loPanorama.Location = new System.Drawing.Point(0, 0);
    loPanorama.Margin = new System.Windows.Forms.Padding(0);
    loPanorama.Name = "Panorama";
    // loPanorama.ScrollBarThickness = 1;
    // loPanorama.ScrollingBackground = true;
    loPanorama.ShowGroups = true;
    loPanorama.Size = new System.Drawing.Size(787, 315);
    loHost = goRadDock.DockControl(loPanorama, Telerik.WinControls.UI.Docking.DockPosition.Left);
    loHost.Text = "Panorama";
   

    Telerik.WinControls.UI.RadPanorama loPanorama2 = new Telerik.WinControls.UI.RadPanorama();
    HostWindow loHost2;
    //' Set Panorama2 Properties
    // loPanorama2.BackColor = System.Drawing.Color.Transparent;
    loPanorama2.Dock = System.Windows.Forms.DockStyle.Fill;
    loPanorama2.Location = new System.Drawing.Point(0, 0);
    loPanorama2.Margin = new System.Windows.Forms.Padding(0);
    loPanorama2.Name = "Panorama2";
    //loPanorama2.ScrollBarThickness = 1;
  //  loPanorama2.ScrollingBackground = true;
    loPanorama2.ShowGroups = true;
    loPanorama2.Size = new System.Drawing.Size(787, 315);
    loHost2 = goRadDock.DockControl(loPanorama2, Telerik.WinControls.UI.Docking.DockPosition.Left);
    loHost2.Text = "Panorama2";


    Telerik.WinControls.UI.RadPanorama loPanorama3 = new Telerik.WinControls.UI.RadPanorama();
    HostWindow loHost3;
    //' Set Panorama2 Properties
    //  loPanorama3.BackColor = System.Drawing.Color.Transparent;
    loPanorama3.Dock = System.Windows.Forms.DockStyle.Fill;
    loPanorama3.Location = new System.Drawing.Point(0, 0);
    loPanorama3.Margin = new System.Windows.Forms.Padding(0);
    loPanorama3.Name = "Panorama3";
    loPanorama3.ScrollBarThickness = 1;
    loPanorama3.ScrollingBackground = true;
    loPanorama3.ShowGroups = true;
    loPanorama3.Size = new System.Drawing.Size(787, 315);
    loHost3 = goRadDock.DockControl(loPanorama3, Telerik.WinControls.UI.Docking.DockPosition.Left);
    loHost3.Text = "Panorama3";
   

    Telerik.WinControls.UI.RadPanorama loPanorama4 = new Telerik.WinControls.UI.RadPanorama();
    HostWindow loHost4;
    //' Set Panorama2 Properties
    //  loPanorama4.BackColor = System.Drawing.Color.Transparent;
    loPanorama4.Dock = System.Windows.Forms.DockStyle.Fill;
    loPanorama4.Location = new System.Drawing.Point(0, 0);
    loPanorama4.Margin = new System.Windows.Forms.Padding(0);
    loPanorama4.Name = "Panorama4";
    loPanorama4.ScrollBarThickness = 1;
    loPanorama4.ScrollingBackground = true;
    loPanorama4.ShowGroups = true;
    loPanorama4.Size = new System.Drawing.Size(787, 315);
    loHost4 = goRadDock.DockControl(loPanorama4, Telerik.WinControls.UI.Docking.DockPosition.Left);
    loHost4.Text = "Panorama4";
  
    goRadDock.EndInit();
 
    loHost.DockState = DockState.AutoHide;      
    loHost2.DockState = DockState.AutoHide;
    loHost3.DockState = DockState.AutoHide;
    loHost4.DockState = DockState.AutoHide;
}

The text alignment of DocumentTabs does not look good when the tabs are left aligned, the close button is visible and the text is vertically oriented (i.e. it looks horizontal when the tabs are aligned to the left). This would be best addressed if there is mechanism for rotating the Padding value of the Tabs when their alignment is different (left, top, etc.)

Workaround: check the designer file and make sure that all existing tool windows are either added to the RadDock or deleted 

FIX. RadDock - double clicking the expand tool window button causes the default form to redraw over the RadForm

The issue is caused by the fact that the drop down button has its own theming in RadDock, which gets applied to the newly added button.

To reproduce:

 protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);

            RadDockEvents.TabStripItemCreating += RadDockEvents_TabStripItemCreating;
            AddDock();
            ThemeResolutionService.ApplicationThemeName = "VisualStudio2012Dark";
        }


        void RadDockEvents_TabStripItemCreating(object sender, TabStripItemCreatingEventArgs args)
        {
            RadDropDownButtonElement btn = new RadDropDownButtonElement();
            btn.Margin = new System.Windows.Forms.Padding(80, 5, 5, 5);
            btn.MinSize = new System.Drawing.Size(50, 20);
            btn.Items.Add(new RadMenuItem("asasda"));
            args.TabItem.Children.Add(btn);
        }

Workaround: use the themes in the attachments

Workaround - set AutoScroll = false to Form that is being shows as MDI child 

This feature request refers to introducing a new ToolWindow property which will allow setting individually text to the ToolWindow's Caption and Tab.

OS language is zh-TW (Taiwan)

using the RadDock component in a product that must support multiple montors.  I see some mention of this in the support forums, but I would like to confirm with you that RadDock does support docking on multiple monitors with dragging of panes/panels between monitors and full serialization of the layout on multiple displays. Add support to move and maximize DocumentWindow and ToolWindow in multimonitor system.

Would be useful to have the option to create the tab close button theme which depends on the states of the button's containing tab.

To reproduce:

Add a RadDock with RightToLeft - Yes and add a few document windows. You will see that the Tabs will be rendered LeftToRight. The insertion behavior is correct.

RadDock - implement BackgroundImage property.

To reproduce:
- Add 2 RadFoms to a raddock in mdi mode.
- Dock the windows by using the left or right docking guide in the center.
- You will notice that the behavior is the same as like using the left or right side guides.

The main form inherit from the RadForm.

MDIChildren of RadDock hosted in HostWindow not serialize DockType property equal to 'Document' in this case and loaded like ToolWindow

Currently, it is not possible to add any RadElement to a TabStripItem in DocumentTabStrip.

Resolution: 
Use the static class RadDockEvents to subscribe to events before InitializeComponent

IMPROVE. RadDock - add possibility for replacing the page items in the DocumentWindows with custom ones.

Resolution: 
Use the static class RadDockEvents to subscribe to events before InitializeComponent

One possible scenario is adding an application menu button like in RadRibbonBar.

This is a follow on from the forum entry http://www.telerik.com/community/forums/winforms/dock/toolwindow-theme-error.aspx 

This is not the exact issue I am having but should hopefully lead you in the correct direction. A panels visibility seems to vary depending on where it is.

If you run the program and open a new tool window by clicking the + button you will get a new docked window.
Change this to a tabbed document.
Then add another window and set it to be docked.
Then add another window and also set it to be docked. Then set it to autohide.

You will see on the tabbed document and the docked unautohide window that there are 2 lines of text. If you now let the auto toolwindow open you will see that there are now three lines of text in this window. The docked autohide is letting the text shine through but only when it is in this state.