function _open() {
			if (that._oDialog) {
				syncStyleClass("sapUiSizeCompact", that._getTable(), that._oDialog._oDialog);
				that._oDialog.open();
			}
		}
Opens the personalization dialog for the Table to modify the visibility and
the order of the columns.

<i>Using this functionality will require to load the sap.m library because the
personalization dialog is only available in this library for now.</i>

@param {object} mSettings
@public
@experimental since 1.21.2 - API might change / feature requires the sap.m library!