Using a drop down menu as navigation

Question

Good morning all!
I have been struggling with making a drop down menu work as navigation for a while and finally need to reach out to all you brilliant people on this forum. 
I currently have a drop down menu with three items(Nav1, Nav, 2, Nav3) corresponding to three pages(Screen1, Screen2, Screen3). When I first created the menu it seemed I could only use the OnChange option to use navigation with the menu because, when using
the OnSelect I only get these options:
If(Datasource!Selected!Title
/// and ///
If(Datasource!Selected!Value
If I use the first option the title listed on my data source doesn't work, I get the red squiggly line. If I use the second option (Value) I have no value listed in my data source. 
Therefore I used the OnChange option, I can get the menu to navigate to the first page, however I realized that this option chances to one single page no matter what the menu option changes to.
Does anyone know how to make a drop down into a fully functioning navigation menu?
The other issue I ran into was resetting the drop down to the first list item upson returning to the screen however,   ptr.chovan,
offered this working solution:
set a variable in screen1 property OnVisible
UpdateContext({active: true})
and in screen1 property OnHidden
UpdateContext({active: false})
Then in dropdown visual add this in Items
If(active=true, .... your data source here ...)
Or perhaps easiest way is instead of resetting datasource of dropdown, you can reset  dropdown default by adding this into Default property
of dropdown
If(active=true, "Screen1")

Answer 1

If your Items in dropdown1 are
["Nav1", "Nav2", "Nav3"]
Then use OnChange property of the dropdown1
If(Dropdown1!Selected!Value="Nav1", Navigate(Screen2,""), Dropdown1!Selected!Value="Nav2", Navigate(Screen3,""), Dropdown1!Selected!Value="Nav3", Navigate(Screen4,""))
Does the other solution of resetting dropdown helped you?