I have created the custom control which is just a panel that I will be using to render my DirectX code. However, I am unable to see the control in my toolbox for when I try to a
Right click the Toolbox, then Choose items and browse for the .dll file that contains your control. The Toolbox will add all the components found in that dll. Also check in Tools -> Options -> Windows Forms Designer if the AutoToolboxPopulate setting is set to true.