How to prevent the expansion of the collapsed nodes when it is been double clicked ?

This can be done by handling BeforeExpand Event handler. Here after getting the MouseClicked Point ,if the node is not equal to null the node's TextBounds property is checked and then e.Cancel is set to true.

The following code will ensure that the node will expand only when clicked on the Node's Expandable button ( that is, the "+" box on the left of the node) and not when clicked on the TreeNodeAdv's text.

C#

private void treeViewAdv1_BeforeExpand(object sender, Syncfusion.Windows.Forms.Tools.TreeViewAdvCancelableNodeEventArgs e)

{

Point p =this.treeViewAdv1.PointToClient(Control.MousePosition);

TreeNodeAdv node=this.treeViewAdv1.GetNodeAtPoint(p,true);

if(node!=null)

{

if(node.TextBounds.Contains(p))

{

e.Cancel=true;

}

}

}

VB

Private Sub treeViewAdv1_BeforeExpand(ByVal sender As Object, ByVal e As Syncfusion.Windows.Forms.Tools.TreeViewAdvCancelableNodeEventArgs)

Dim p As Point =Me.treeViewAdv1.PointToClient(Control.MousePosition)

Dim node As TreeNodeAdv=Me.treeViewAdv1.GetNodeAtPoint(p,True)

If Not node Is Nothing Then

If node.TextBounds.Contains(p) Then

e.Cancel=True

End If

End If

End Sub