Change Menu Editor method and Add Frame to Form

Given a Form [form1] with a Datagrid [3 Columns, X/Y/Z] and a few rows.
In the Menu Editor, VIEW / SELECT COLUMN is unchecked.

The change I want to implement is the following: when the user selects VIEW / SELECT COLUMN I want a check mark to appear beside SELECT COLUMN [meaning it has been selected on/active] and a Frame to add to my form containing 3 check boxes [for each column] so the user can un-check some and only view the selected columns in the Datagrid itself

So I must implement the following:
a) How do I make it so that the SELECT COLUMN thing in my menu has a Checkmark or not? [Currently when I click on the it “Click” method is loaded]

b) How do I dynamically add a Frame to my form when this is selected? Would it be better to just load a new Form instead? [and pass the parameters back and forth?]

The other choice would be to create a whole new Form for the SELECT COLUMN section and pass the variable back and forth, I thought this would be less efficient [any comments?]