Controls of custom page not visible !

Hello,
i am using InstallOptions.nsh in order to create a custom page and an .ini file where i define the controls.

The problems is that some of the controls are not visible when i try the setup !
When i do a mouse over them they appear and after the button "Cancel" is pressed they disappear once again.

Also some Link controls that i have added do not appear at all unless i mouse click on them !

Can this be caused because some controls overlap each other or are positioned beyond the page size ? What is the default maximum page height and width in dialog units ?

Any help ?

Thanks !

i found the error. i did have set Bottom=-1 in the ini and the contros overlapped.