As you can see in that screenshot in "objArgs" there is a property "Text". How can I reach that property?

You need to cast the args to ToolBarItemEventArgs, at which point you can access the ToolBarButton it refers to:
var toolBarArgs = (ToolBarItemEventArgs) objArgs;
switch (toolBarArgs.ToolBarButton.Text)
{
...
}
However, I would suggest not switching on the text. Instead, ideally set up a different event handler for each of your buttons. If you really can't do that, you can use:
var toolBarArgs = (ToolBarItemEventArgs) objArgs;
var button = toolBarArgs.ToolBarButton;
if (button == saveButton)
{
...
}
Or you could switch on the Name rather than the Text - I'd expect the Name to be basically an implementation detail, whereas the Text is user-facing and could well be localized.
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