Ext JS 4 – Enable/Disable based on Grid Selections

	buildSelectionModel : function () {
		return Ext.create('Ext.selection.CheckboxModel', {
			listeners: {
				scope: this,
				selectionchange: function(sm) {
					if (sm.getCount()) {
						this.approveBtn.enable();
						this.denyBtn.enable();
					} else {
						this.approveBtn.disable();
						this.denyBtn.disable();
					}
				}
			}
		});
	}
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