You can use Mockplus Classic hotkeys to quickly add basic components, for example,
create a button: B
create a label: A
create a text area: T
create a shape: S
create an icon: C
create an image: E
create a textbox: R
create a line segment: X
Get the cursor into the canvas, simply type B, E or A… and you will be able to quickly create a relative component at the spot where the cursor is.