Not found SetResourceReference in new Groupbox I'm creating in code behind

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WPF

PowerBuilder

Can you help me with this problem?

want to set a reference to a Template in a groupbox I'm creating in the code behind.In a example I found, they mostly use SetResourceReference method. However, I see that this method doesn't seem to exist on the new Groupbox property in creating.
XAML:

<ControlTemplate TargetType="GroupBox" x:Key="GBTemplate">

Code Behind:

groupbox gb_plat
gb_plat= create GroupBox
gb_plat.SetResourceReference(Groupbox.TemplateProperty,"GBTemplate")

This method have come out with 2 errors, 1.Undefined variable: "TemplateProperty" 2. Can not find element "SetResourceReference"

I am using Powerbuilder.net

Thanks