How can I prevent TabView from resetting the current tab?

Question

This is a simplification of a problem that has arisen in a project regarding Euclidean activities for verifying proportions via operations on pairs of magnitudes. In the project, the LocatorPane is used to enter values for x, y that will be used in carrying out operations on pairs of line segments in order to allow the user to ascertain whether the line segments reflect the ratio, y:x, where x, y are positive integers.

The code below captures the essence of the technical problem I have run into.

I am using LocatorPane to select values (x,y) that will be used in each of the tabs in TabView. However, each time a new locator value is selected, the TabView defaults to the first tab, 1. To test this, click on either tab 2 or tab 3; then set the locator value. TabView will automatically reset to tab 1.

Test Code

Manipulate[
 Row[{
   TabView[{
     1 -> Row[{pt[[1]], pt[[2]]}, "\t"],
     2 -> Row[{2*pt[[1]], 2*pt[[2]]}, "\t"],
     3 -> Row[{3*pt[[1]], 3*pt[[2]],}, "\t"]}],
   LocatorPane[Dynamic@pt, Graphics[{Gray, Disk[]}]]}]]

---

I tried a variation in which a LocatorPane is placed within each tab, but the reset problem continues to occur.

Answer 1

Add some Dynamic[] and a variable to keep track of the selected tab:

Manipulate[Row[{
   Dynamic@TabView[{
      1 -> Pane[Row[{pt[[1]], pt[[2]]}, "\t"], 150],
      2 -> Pane[Row[{2*pt[[1]], 2*pt[[2]]}, "\t"], 150],
      3 -> Pane[Row[{3*pt[[1]], 3*pt[[2]]}, "\t"], 150]
      }, Dynamic@i], 
   LocatorPane[Dynamic@pt, Graphics[{Gray, Disk[]}]]}], {{pt, {0., 
    0.}}, None}, {{i, 1}, None}]

Oh, I added a Pane because it was a pain with the graphics jumping around depending on how many digits were displayed.

The Dynamic@TabView[...] keeps the whole body of the Manipulate from being re-executed when pt is changed (which interrupts dragging the Locator).