Adding an event dialogue box in SpaceScroller demo

Hi,

I need help to add an event into Space Scoller Demo.
What I tried to accomplish was;

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when Boss Ship appear,
all ther smaller ships on screen will go away from the screen,
and stop summoning small ships into the screen
then the background tiles scrolls 1/10 slower

disable player keys

Boss ship initiate dialogue
[picture boss pilot] ["Fool, you will die for trespassing my place"], press fire to continue or wait for 5 sec to automatically process to next dialogue

player ship initiate dialogue
[picture player pilot] ["shut up and die!!"], press fire to resume gameplay or wait 5 sec to automatically resume gameplay and restore the tile to scroll at original speed.


when boss dies
then continue to summon ships at previous wave pattern
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so my questions;
1) Do i use Button Ctrl Gui to display the picture of pilot? or ChunkBitmapGui?
2) for the dialogue, do i use also Button Ctrl Gui or Multi line text Gui or simply..again.. Chuck Bitmap Gui?
3) how do i stop the smaller ships to stop swarming the screen? because the schedule was initially set to appear at certain intervals.
4) is it possible to set the boss to appear only once by using schedule?


Thanks for your time in answering my questions.

Cheers,
Sky