How do you select multiple items in that element manually when you are interacting with it yourself? The answer to your question is to follow the same steps as you would take. i.e. do you hold down the control key? if so then you would need to do the same with blue prism.
Yes, you are right. I need to hold down the control key, but how can I click the left mouse button at the same time? I tried to use SendKeys(""^{ENTER}""), but no use.
