Dynamically add controls to footer row using RowTemplate

Create a Class that inherits ITemplate and add controls the container ; you want to add.
Assign the object of that class to ASPxGridView's Templates.FooterRow property as:

ASPxGridView1.Templates.FooterRow = new CustomFooterRowTemplate();
And the code snippet of the template class is below:
public class CustomFooterRowTemplate: ITemplate
     void ITemplate.InstantiateIn(Control container)
         Button button = new Button();
         button.Text = "Test"; 

have an idea from this and you can add more controls and even you can use their event handler in the custom template except using on the RowCommand event.