Hello,

Could you please try that:

if (e.Pane.DockedState == Infragistics.Win.UltraWinDock.DockedState.Floating) (e.Pane as DockableControlPane).Control.FindForm().WindowState = FormWindowState.Maximized;

In AfterToggleDockState and/or AfterDockChange events.

Please review my sample.

Please feel free to let me know if a question about our toolset comes up on your mind.

Thank Hristo for your answer. It is very helpful to me!

And I have a question.

How can i set ButtonStyle of ButtonUIElement. ButtonStyle of ButtonUIElement is read only property. so I dervied ButtonUIElement class and override ButtonStyle property. as following code. but the following code doesn't work.

public class CButtomUIElementEx : Infragistics.Win.ButtonUIElement
{
    private UIElementButtonStyle buttonStyle = UIElementButtonStyle.OfficeXPToolbarButton;

    public UIElementButtonStyle StyleOfButton
   {
       get { return buttonStyle; }
       set { buttonStyle = value; } 
    }

    public override UIElementButtonStyle ButtonStyle
   {

       get { return buttonStyle; }
    }

     public CButtomUIElementEx(UIElement parent)
           : base(parent)
    {
    }

}

I wanna change style of ButtonUIElement. How can i do it? 

http://ko.infragistics.com/community/forums/t/68741.aspx

and it brings me to the pointed thread. However I am reposting the answer with the sample  from the mentioned forum thread, which was verified as answer:

“Hello ,

As far as I understand you are trying to mimic behavior of Visual Studio 2010, where you could maximize floating windows. The Maximize/Minimize buttons on the dock pane are used to maximize/minimize a control pane within a group pane. If there is only one control pane within the group pane, these buttons will be disabled. But you could achieve a behavior very close to this of Visual Studio, if you add a button with creation filter to the floating window, and on click of this button to resize the floating window to occupies the screen. I have implement my suggestion in a small sample, please see attached sample.

More information about creation filter you could find on the following link:

http://help.infragistics.com/Help/NetAdvantage/WinForms/2011.1/CLR2.0/html/Win_Creation_Filter.html

I hope that this will helps you

”