How to hide controls in my PMP?

Hello there,

I've been using the Solidowrks API for a couple of weeks now and I still have no idea how to do the following:

Let's say I have made a  Property Manager Page  (PMP) for my add-in.

In my PMP I have 3 buttons:   BTN_SHOW ,  BTN_HIDE  and BTN_DUMMY

They are all created using this line for each of them:

BTN_SHOW= (IPropertyManagerPageButton)usedTab.AddControl(button1ID, controlType, "Show", align, options, "This is supposed to show BTN_DUMMY when clicked");

I don't understand how to HIDE buttons (and controls in general).  There is no  BTN_DUMMY.Hide()   or anything.  I'm really lost here. 

So MY QUESTION is:

HOW do I hide / show  controls on my PMpage (buttons, listboxes, radiobuttons etc)  with a click on my BTN_HIDE button?  Or how do I just do it in general? What's the code I need?

I know it's probably something really obvious but I'm stuck.

Thanks in advance,

PiF

SolidworksApi macros