null
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@param approveButtonText_ the custom text string to display in the Approve button.
@return the return state of the file chooser on popdown:showDialog
sets this dialog as visble, and brings it to the front.
Show the dialog. The dialog will be created if it doesn't exist yet. Before setting the dialog visible, a hook method onAboutToShow is called and the location will be set.
When showing the dialog several times, it will always be opened on the location that has been set, or relative to the parent. (former location will not persist)
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