Why would a developer use an ArrayStore?

Which function would a developer use to select only certain child elements of an Ext.element?

What is the name of the property on a grid that controls the number of clicks required to edit a cell on a GridPanel?

Which of the following is not a valid way to add an event listener?

What of the following is the correct syntax for defining column?

In a form layout, what is the name of the property that will automatically create a label above a control if set?