RadControls for WinForms
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 You can programmatically access your child templates using RadGridView.MasterGridViewTemplate.ChildGridViewTemplates templates collection. For example to modify AutoSizeColumnsMode to Fill in the first child template use the following code:

 

Copy[C#] Accessing child templates
// this.radGridView1.MasterTemplate.Templates[0].AutoSizeColumnsMode = Telerik.WinControls.UI.GridViewAutoSizeColumnsMode.Fill;
Copy[VB.NET] Accessing child templates
Me.RadGridView1.MasterTemplate.Templates(0).AutoSizeColumnsMode = Telerik.WinControls.UI.GridViewAutoSizeColumnsMode.Fill