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in this step of the tutorial I'm going to show you how to connect the form we created in the previous step to the grid first thing we want to do is still make sure this form is invisible by default so inside the UI implementation and init method I'm going to call the set visible method over here and the idea is that if I click a customer then the form should be visible but if I deselect it it should be invisible so it looks like we need to add some kind of listener to this grid right and well there is a listener for that which is the selection listener so let's use a lambda expression to define this listener and using this event instance here we can get the selected value as a collection so because it is a collection we can ask if it's empty or not right so let's do that and if it is empty that means there's nothing selected of course all we need to do is to make the form invisible but if there is something selected here we need to get that value so this is a collection we can get the...