Thank you for your interest in the RadToolBar control.
Current implementation of the toolbar is with a StackPanel as strip row. This is the reason all the toolbar's items to layout in its left side. However we found your idea very nice and updated your Telerik points.
About items' styling: the toolbar uses the ItemContainerStyleSelector
in order to restyle some of most popular controls (currently we are supplying styles for RadSeparator, TextBlock, TextBox, Button, ToggleButton, CheckBox, RadioButton). This way in order to re-style your control you should assign it with a new style - indeed if you look in toolbar's style you will find just one StackPanel nested in a Grid (both very clear) and nothing to propagate to items. If you plan to place this user-control inside a toolbar please have a look inside all predefined toolbar items styles - there are many ideas how to make a control good looking inside the toolbar.
Hope this information helps.
the Telerik team
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