In the grid, we would like to add a separate button under the combo box dropdown to open the pop-up or for some other click event. Can this be implemented, if yes, please provide guidance over it?
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Not supported out of the box, but reasonably easy to implement. You will need to implement your own https://bryntum.com/docs/scheduler/#Core/widget/PickerField showing a Panel as the drop down widget, then you can use its https://bryntum.com/docs/scheduler/#Core/widget/Panel#config-bbar to show a button.