WebDialog.cs

		//Defining action DataView
		public PXAction<MyDAC> MyButton;
		//Defining Button Attribute with tooltip
		[PXButton(Tooltip = PX.Data.Update.Messages.MyTooltip)]
		//Providing title and mapping action access rights
		[PXUIField(DisplayName = "MyTitle", MapEnableRights = PXCacheRights.Delete, MapViewRights = PXCacheRights.Delete)]
		protected void myButton()
		{
			WebDialogResult result = Companies.Ask(ActionsMessages.Warning, PXMessages.LocalizeFormatNoPrefix("My Message"), 
				MessageButtons.OKCancel, MessageIcon.Warning, true);
			//checking answer	
			if (result != WebDialogResult.OK) return;

			//Do usefull stuff.
		}