This is simple dialog that gets open by pressing button as on the sample :
Hello,Thank you for contacting us.
I manage to look at the sample that you send to us, and the behavior that you are experiencing is because of the default behavior of the html elements when you set a title attribute over them. So in order to be able to overcome this I recommend you to use our igxDialogTitle directive. This is your sample with the applied necessary changes in order to see the tool tip only over the title of the dialog ng5-ig-dialog.zip.
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Thanks for showing how to change label.. regarding issue #2 attached sample .. when you open dialog window and move mouse inside without pressing, it will show what is in the dialog title in the tool tip all over the dialog window.. in this case it will be "Tool Tip: Just wonder if it is possible to remove it. Thanks.ng5-ig-dia-up_modified.zip
I am sending you a small example in order to see in action how you can change the button label dynamically. About your second question: the dialog component by default there is no tool tip added over any of it's element, so in order to be able to help can you please give me more detailed information about your case or you can apply the necessary corrections over the example that I send to you below and send it back to me.
I am looking forward to hear back from you, and also if you have any additional questions, please contact us.