I just changed my code a bit and removed any explicit sizes on the 
PopupPanel itself. Now when adding a Label without any size or something 
else with explicit sizes everything still works as expected without using 
any deferred command.

@Ed: We use LayoutPanel inside PopupPanel so either the PopupPanel or the 
LayoutPanel needs an explicit size. We choose to give the PopupPanel an 
explicit size. The size itself is in pixel (small wizards, large wizards, 
etc.) and because we want the wizard to always stay at the center of the 
screen and the wizard should always fit inside the visible browser window 
during window resizes we have to recalculate its pixel size and then 
calling center() again. 
We mainly did that for iPad compatibility so that the wizard does not have 
an odd position/size when you rotate the iPad from landscape to portrait or 
vice versa while the wizard is visible.

-- J.

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