Hi,
If you drag and drop different PageViews in the MultiPage directly, you'll see that the MultiPage on the form says the warning message above. To resolve this, PageViews need to be typed by hand.
For example:
<iewc:multipage id="MultiPage1"
runat="server" BorderWidth="1px" BorderColor="Black"
Height="365px" Width="407px">
<iewc:PageView id="View1">
<h3>View1</h3>
</iewc:PageView>
<iewc:PageView id="View2">
<h3>View2</h3>
</iewc:PageView>
<iewc:PageView id="View3">
<h3>View3</h3>
</iewc:PageView>
</iewc:multipage>
For more information, see http://msdn.microsoft.com/en-us/magazine/cc188778.aspx (Section: MultiPage and TabStrip).
I hope this helps.
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