will give you a list of all categories and this control will not show you hierarchical structure. One of the solution here is creating a custom control that implements ITextControl and use RadComboBox that wraps RadTreeview with a template
which is bound to all categories
If you want to have two RadComboBox controls, again you need a custom control. It is better to use one control that wraps two RadComboBox controls. You can bind the first control and subscribe for SelectedIndexChanged
where you can bind the second control
ICategory rootCategory = Manager.GetCategory(RootCategory);
categories = Manager.GetCategoriesTree(rootCategory);
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