When I scroll a TreeViewAdv control with a gradient background, it is not rendered correctly. Why?

When the BackgroundColor style property is set to Gradient, you need to call Refresh method during both horizontal and vertical scrolling to ensure proper rendering.

//Call Refresh during Horizontal and Vertical Scrolling
private void treeViewAdv1_VerticalScroll(object sender, System.Windows.Forms.ScrollEventArgs e) 
{  
   this.treeViewAdv1.Refresh(); 
}

//Call Refresh during Horizontal and Vertical Scrolling
private void treeViewAdv1_HorizontalScroll(object sender, System.Windows.Forms.ScrollEventArgs e)
{
   this.treeViewAdv1.Refresh();
}

'Call Refresh during Horizontal and Vertical Scrolling
Private  Sub treeViewAdv1_VerticalScroll(ByVal sender As Object, ByVal e As System.Windows.Forms.ScrollEventArgs)  
Me.treeViewAdv1.Refresh() 
End Sub   

'Call Refresh during Horizontal and Vertical Scrolling
Private  Sub treeViewAdv1_HorizontalScroll(ByVal sender As Object, ByVal e As System.Windows.Forms.ScrollEventArgs)  
Me.treeViewAdv1.Refresh() 
End Sub

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When I scroll a TreeViewAdv control with a gradient background, it is not rendered correctly. Why?

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