Returns the container Current size, in pixels, excluding the decorations. Usefull for IupFrame, IupTabs and IupDialog. Can also be consulted in IupVbox and IupHbox, it will excludes the margins. For controls that have a native representation is only available when the control is mapped.
"widthxheight", where width and height are integer values corresponding to the horizontal and vertical size, respectively, in pixels.
All elements that are containers, except menus.