how to get the width & height of dialog box (also calculate the actual size of dialog when it was shown) in GWT?

I have a dialogbox holding a HTMLPanel that has a flextable & 2 buttons.

So I tried myDialog.getOffsetWidth & myDialog.getOffsetHeight, it showed some result but somehow it doesn't count the size of the widgets inside HTMLPanel inside DialogBox.

how to get the width & height of dialog box (also calculate the actual size of dialog when it was shown) in GWT?

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