Extended Library for WPF and Silverlight | ComponentOne
Expander / Expander Features / Working with the C1Expander Control / Initial Expand State
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    Initial Expand State
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    By default, the C1Expander.IsExpanded property is set to False, which means that the control appears in its collapsed state when the page is loaded. If you want the control to be expanded upon page load, you can set the IsExpanded property to True .

    The following table illustrates the difference between the two expand states.







    You can set the expand states in Blend, XAML, or code.