Hi;
I developed a module for DNN 4.9 which is working well but i just didn't find a way to show custom alerts the way DNN show it's alerts and error messages.
Let's say the login window, when you try an invalid login it shows an error message with a red icon which looks like a default alert style.

How do you clear this message?

My module is ajax enabled and would like to clear this message.

Thanks for the help, here is what I did:

Added a placeholder control inside the updatepanel (note id=):
<asp:PlaceHolder runat="server" id="MessagePlaceHolder" enablev13wstat3="false"></asp:PlaceHolder>

And then used that control for my messages:
DotNetNuke.UI.Skins.Skin.AddModuleMessage(MessagePlaceHolder, "Message", DotNetNuke.UI.Skins.Controls.ModuleMessage.ModuleMessageType.RedError);