How to retain the selection rectangle on the selected TreeNodeAdv when the TreeViewAdv loses focus and how to control style of selection ?
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Set the TreeViewAdv's HideSelection property to False for this purpose:

The appearence of selection rectangle can be changed by followinf 2 properties

TreeViewAdv.InactiveSelectedNodeBackground : Assign an object of Brush

TreeViewAdv.InactiveSelectedNodeForeColor : Sets the fore color

C#
// to ensure that the selected node is highlighted always
this.treeViewAdv1.HideSelection = false;
// set custom colors to the selection rectangle
this.treeViewAdv1.InactiveSelectedNodeBackground = new Syncfusion.Drawing.BrushInfo(System.Drawing.Color.MediumBlue);
this.treeViewAdv1.InactiveSelectedNodeForeColor = SystemColors.ActiveCaptionText;
VB
' set custom colors to the selection rectangle
' to ensure that the selected node is highlighted always
Me.treeViewAdv1.HideSelection = False
Me.treeViewAdv1.InactiveSelectedNodeBackground = New Syncfusion.Drawing.BrushInfo(System.Drawing.Color.MediumBlue)
Me.treeViewAdv1.InactiveSelectedNodeForeColor = SystemColors.ActiveCaptionText
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