Thanks for the reply. infact i want to activate the group header using tab key. if i use leave event and i click in any other place the next will be active which is also wrong. bcoz this line

this.ultraExplorerBar1.ActiveGroup = group2;

 will always execute whenever leave event will fire.

Asad 

I'm not sure if I understood your last post. By default, the control navigates across group headers when the Tab key is pressed, although it also tabs into the item area. You can remove the keyboard actions that cause this, and add mappings that only navigate through the group headers instead if you like; the following code sample demonstrates this:

    UltraExplorerBarKeyActionMappingsCollection keyMappings = this.explorerBar.KeyActionMappings;
    for ( int i = keyMappings.Count - 1; i >= 0; i -- )
    {
        UltraExplorerBarKeyActionMapping keyMapping = keyMappings;
        if ( keyMapping.KeyCode == Keys.Tab )
            keyMappings.Remove( keyMapping );
    }

    UltraExplorerBarKeyActionMapping keyMappingNext = new UltraExplorerBarKeyActionMapping(
        Keys.Tab,
        UltraExplorerBarAction.ActivateNextGroup,
        0,
        UltraExplorerBarStates.ActiveGroupExists,
        SpecialKeys.All,
        0);

    UltraExplorerBarKeyActionMapping keyMappingPrev = new UltraExplorerBarKeyActionMapping(
        Keys.Tab,
        UltraExplorerBarAction.ActivatePreviousGroup,
        0,
        UltraExplorerBarStates.ActiveGroupExists,
        SpecialKeys.AltCtrl,
        SpecialKeys.Shift);

    keyMappings.Add( keyMappingNext );
    keyMappings.Add( keyMappingPrev );
   
    this.explorerBar.AcceptsFocus = DefaultableBoolean.True;