Silence compiler warning
iOS7 uses new method for popover content size
Upgrade to new iOS7 compatible version of WEPopover
Use system buttons to benefit from automatic translation of button labels (Done and Cancel)
Interface guidelines suggest to have the Done button to the right and Cancel button to the left

And this becomes consistant with the button position on the popover
When running on iOS7, the status bar is part of the toolbar, fix this geometry
Silence compiler warning