Creating a message box with no buttons

Hello everyone,

I'm new to C++ Builder and I need to show a message to the user, something like "Conecting...", while my program finishes establishing serial communication.

I know ShowMessage() give me a popup window, but it has an "OK" button in it. I need a blank piece of window, just to inform that the user must wait.
It also must not have the Close (X) button. Is there a fuction just like ShowMessage() to create my window? Or I need to create a new form just to show such a little message? Thanks in advance!!