How to change the MDI tab size

You should handle theTabControlAdded event handler and use ItemSize property to change the tab size.

// Handle the TabControlAdded event. 

this.tabbedMDIManager.TabControlAdded += new TabbedMDITabControlEventHandler(tabbedMDIManager_TabControlAdded); 

private void tabbedMDIManager_TabControlAdded(object sender, TabbedMDITabControlEventArgs args) 

{ 

// To change the size. 

args.TabControl.ItemSize = new Size(40, 40); 

}
' Handle the TabControlAdded event. 

AddHandler tabbedMDIManager.TabControlAdded, AddressOf tabbedMDIManager_TabControlAdded

Private Sub tabbedMDIManager_TabControlAdded(ByVal sender As Object, ByVal args As TabbedMDITabControlEventArgs)

' To change the size. 

args.TabControl.ItemSize = New Size(40, 40)

End Sub