DForm

 
local TestingForm = vgui.Create( "DForm", DermaPanel )
TestingForm:SetPos( 25, 50 )
TestingForm:SetSize( 350, 50 )
TestingForm:SetSpacing( 10 )
TestingForm:SetName( "Testing Form Thing" )
TestingForm.Paint = function()
    surface.SetDrawColor( 255, 51, 15, 255 )
    -- I draw a box here to show where the form is outlined
    surface.DrawOutlinedRect( 0, 0, TestingForm:GetWide(), TestingForm:GetTall() ) 
end
 
    local FormContentOne = vgui.Create( "DCheckBoxLabel" )
    FormContentOne:SetText( "Use Props?" )
    FormContentOne:SetConVar( "some_convar" )
    FormContentOne:SetValue( 1 )
    FormContentOne:SizeToContents()
TestingForm:AddItem( FormContentOne )
 
    local FormContentTwo = vgui.Create( "DNumSlider" )
    FormContentTwo:SetText( "Max Props" )
    FormContentTwo:SetMin( 0 )
    FormContentTwo:SetMax( 256 )
    FormContentTwo:SetDecimals( 0 )
    FormContentTwo:SetConVar( "sbox_maxprops" )
TestingForm:AddItem( FormContentTwo )