Dispaly of graphic elements of a dynpro in a HTML template

Hi,

I have a question :

It is enough that a graphic element of a dynpro (for example a boutton) exists in the dynpro that it is recognized on the level of template HTML ?

Because in an example of template code I saw something like :

`if (Button_name.exist)`
    `Button_name.label`
`else`
   .....
`end`

Thanks & regards