Represents the toolbar tool for grouping columns of the Grid.
Use this directive on any kendo-toolbar-button
inside a ToolbarComponent in the Grid.
When you click the toolbar button with this directive, the group
event is triggered.
<kendo-grid>
<kendo-toolbar>
<kendo-toolbar-button text="Group" kendoGridGroupTool></kendo-toolbar-button>
</kendo-toolbar>
</kendo-grid>
[kendoGridGroupTool]