<script>
    (function () {
        try {
            Telerik.Web.UI.RadToolTip.prototype.set_targetControlID = function (value) {
                if (this._targetControlID != value) {
                    this._targetControlID = value;
                    var targetControl = (this._targetControlID ? $get(this._targetControlID) : null);

                    // Start Workaround
                    try {
                        if (targetControl.control && targetControl.control instanceof Telerik.Web.UI.RadMultiColumnComboBox) {
                            targetControl = targetControl.control.get_kendoWidget().input[0];
                            // Only needed if positioning to the right (Position="MiddleRight")
                            if (this.get_position() == 23) {
                                // Access the DropDown Button element
                                var dropDownButton = $(targetControl.parentElement).find('.k-select[role=button]')[0];
                                // Update the offset according to the button's width
                                this.set_offsetX(dropDownButton.getBoundingClientRect().width);
                            }
                        }
                    } catch (e) {
                        // Telerik.Web.UI.RadMultiColumnComboBox is not available.
                    }
                    // End Workaround
                    this.set_targetControl(targetControl);
                }
            }
        } catch (e) {
            // Telerik.Web.UI.RadToolTip is not available.
        }
    })()
</script>