openPopover(opener) {
      console.warn("The method 'openPopover' is deprecated and will be removed in future, use 'showAt' instead."); // eslint-disable-line
      this._openPopover(opener);
    }
Shows the ColorPalettePopover.
<b>Note:</b> The method is deprecated and will be removed in future, use <code>showAt</code> instead.
@param {HTMLElement} opener the element that the popover is shown at
@public
@method
@name sap.ui.webc.main.ColorPalettePopover#openPopover
@since 1.0.0-rc.16
@deprecated The method is deprecated in favour of <code>showAt</code>.