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c#winformstelerikradtreeview

C# How to change background of workspace a RadTreeView in the part where there isn´t nodes

My RadTreeView is Dock Fill in a Panel, when paint the nodes is a part without nodes, that part I have not been able to change color enter image description here

I tried with 

RadTV_Menu_Principal.BackColor = SystemColors.Highlight;

and 

RadTV_Menu_Principal.RootElement.BackColor = SystemColors.Highlight;

but no change. Help me please.

Solution 
  • Me.RadTreeView1.TreeViewElement.BackColor = Color.White
Me.RadTreeView1.TreeViewElement.GradientStyle = GradientStyles.Solid

    Try like this for me work.