function sizeOf(oArea) {
			var oSize = oArea && oArea.getVisible() && oArea.getSize();
			return oSize || "0";
		}
Renders the HTML for the given control, using the provided.
{@link sap.ui.core.RenderManager}.

@param {sap.ui.core.RenderManager} oRm The RenderManager that can be used for writing
           to the Render-Output-Buffer
@param {sap.ui.core.Control} oControl An object representation of the control that should
           be rendered