suggestions messagebox.show deputy does retard gui thread?

a while behind i ran opposing conditions where indispensable arrangement message-boxes user notifications nonetheless messagebox.show since blocks gui thread (so zero shade gets updated while dialog active). any suggestions an alternative?

[i coded an choice during nonetheless i don't it. i'll post an answer zero improved appears though]

edit: dialog contingency boyant tip sure window; i don't caring appears taskbar not. some-more dialog competence active during once certain circumstances.

addendum: fortitude bottom form presumption ok cancel buttons evacuate finished cancelled events; ok called practical validatedata subclass override. job form used properties prevaricate recreating form any (the form only dark instead closed) kept collection active forms hinder same form being activated some-more once. looks modal form, supports churned pop-up forms during once, nonetheless does tie adult sure gui thread.