how can change the font or colour in Navsion 2009 sp1 pages onAction event

Dynamics 365 Business Central/NAV Developers Forum
1

Hi

I am using Navision 2009 SP1.

how can change the font size, style or colour in Navsion 2009 sp1 pages onAction event.

similarly how can enable/disable textbox or Action in Navsion pages on any field validate trigger or onAction event.

Thanks