Sometimes you may wish to create a custom VGUI Panel for an addon or gamemode.

Create a Table

The first step in creating a custom VGUI Panel is to create a table.

Then Add Functions

We can give our table a function so Garry's Mod knows what to do to it when it's initialized.

We use self:SetSize( 100, 100 ) to set the size of our panel to 100 pixels wide and 100 pixels tall. self:Center() centers our panel in the middle of our parent (if no parent is given it will center the panel in the middle of the screen).

We can also give our table a function to tell Garry's Mod what we should do when we want to paint the panel on the screen.

In this function we call draw.RoundedBox(...) to draw our panel with the dimensions defined in self:SetSize(). We start at 0,0 because this is the top-most-left-most point in our panel.

Finally We Register

The final step in creating a custom VGUI Panel is to register the table.

Where; "MyFirstPanel" is the desired name of your panel to be used when you wish to create it. PANEL is the table we have created and "Panel" is the type of element you wish to use as a base.

Result

You can now create your custom panel by using

or

Complete Code