Hi Hugo Aristizabal,
There is no need to define columns collection if you do not need to. You can use the property of RadGridView AutoGenerateColumns and set it to "true". Thus the columns will be based on the properties of the data item it is bound to. A column is created for every public property of simple type (integer, string, date, enum and boolean).
As for your second question, you can hide or show programatically a column with a specific index. If you want to use Check Boxes, you may add the following lines when each one is checked:
this.RadGridView1.Columns.IsVisible = false;
Where the index in Columns[ ] specifies the column you want to hide or if it is set to "true" - to show.
I hope that helps.
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