Pushes a group of items onto the GUI stack.
The data chunk at hl consists of several entries to insert into the GUI stack, each formatted as:
.dw Size .db Type .db Data
Please note that the Size is is the size of the data plus the type byte plus the size word, or sizeof(data)+3. After the last item, the two-byte sequence $FF,$FF must be appended to signal the end of the data section.
hl = Pointer to first byte of stack data.
Adds the specified entries to the GUI stack. This routine does not render the GUI, however.