Hello Jason Hedges,
In the ControlDesigner you should have RadComboBox control. In the control that uses your control designer you should have a property where you have to persists selected value.
here is a sample code
((ControlWithCustomDesigner)DesignedControl).Index = combo.SelectedValue;
((ControlWithCustomDesigner)DesignedControl).RadEditiorDialogValue = TextBoxFromTemplate.Text;
] = value;
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