Maintaining cursor when on GUI

[Seventeen Uncles]

Hi again all i've started work on my GUI and im struggling to find a decent tutorial or guide (everything seems either too simple, too advanced without explination, or outdated) to get a few things working.

heres an image of my GUI, its mainly a basic inventory window.



it only lets me select inventory items when ive got the 'interact' cursor open BEFORE I open the gui (as you can see it changes to the default cursor when over the GUI.)

What i'd like to happen is for the cursor to maintain its status when moving to the inventory window, so i can use 'Look' or 'Interact' at will, or indeed use an  inventory cursor on a piece of inventory in the window.

is this possible? or do i have to put buttons within the GUI to select these functions? (i hope not, will make the GUI quite messy.)

thanks in advance.