I've got another question:

A panel should appear, if I click on a model/entity and it should appear everytime I click on that model/entity, even if I clicked the "NO"-button before.

How should I do that?

add ENABLE_CLICK to model eflags, make an EVENT_CLICK event that sets the panel's SHOW flag.

how to do that?
i'm sorry, i'm a beginner with lite-c

i have this entity:

Beere1 = ent_create("Beere.mdl", vector(0, -200, 0), NULL);

and this panel:

PANEL* essen1_pan =
{
bmap = "Beere_essen_bmp";
pos_x = 550;
pos_y = 15;
button (15, 40, "Ja.bmp", "Ja.bmp", "Ja.bmp", Beere1_essen, NULL, NULL);
flags = OVERLAY | SHOW;
button (85, 40, "Nein.bmp", "Nein.bmp", "Nein.bmp", nein1, NULL, NULL);
flags = OVERLAY | SHOW;
}


Please help me.

PANEL* essen1_pan =
{
bmap = "Beere_essen_bmp";
pos_x = 550;
pos_y = 15;
button (15, 40, "Ja.bmp", "Ja.bmp", "Ja.bmp", Beere1_essen, NULL, NULL);
flags = OVERLAY | SHOW;
button (85, 40, "Nein.bmp", "Nein.bmp", "Nein.bmp", nein1, NULL, NULL);
flags = OVERLAY | SHOW;
}

function event_function()
{
if(event_type == EVENT_CLICK)
{
set(essen1_pan,SHOW);
}
}

function beere1_func()
{
my.emask |= ENABLE_CLICK;
my.event = event_function;
}

Beere1 = ent_create("Beere.mdl", vector(0, -200, 0), beere1_func);

thank you, it works

something more:
at the moment, the panel is here from the beginning
it should appear first if I click on the model

how to do that?

just remove the SHOW flags from panel definition.
moreover, one line of "flags = OVERLAY;" is enough, because it is definition for the panel, not for the buttons.

Thank you very much!