Marcelino Sanchez you are going to hate my answer.

There is a good reason Richard advises strongly not to use Tab controls. They are not perfect. They were designed for users of much less experience than you.

My advice:

Go back to controlling your code with menus.

I've used tab controls in some projects, they just take some getting used to - they're not as buggy as they used to be.

When you say "outside of the tab control itself", do you mean, "they open in the same form, but not in the appropriate tab", or "they don't open in the form, the open a separate form".

In the first case, it means that you didn't get the subform control seated into the tab properly.

In the second case, it means that you're not using proper subform notation in your double-click event.

If neither, then, would need more information to be helpful

The form opens but not in the appropriate tab.

Would need to see what code you have in your dblclick event to be able to understand.

With tabs, if you have a form in each tab, it would have to be in a subform control and your double click event would be effectively changing the recordset or the filter of the form in that sub form.

If the sub form is loading the form correctly with your double click event inside the calling form, then it just means that the sub form isn't properly placed (seated) in the appropriate tab. That's easy enough to fix but I don't have enough info yet to determine which correction path to suggest.

Donald, the code below is what I have in the DblClick event of the calling form (PlantListF) which is in one tab:

    DoCmd.NavigateTo "PlantEntryF"
    DoCmd.OpenForm "PlantEntryF", , , "PlantID=" & PlantID

My PlantEntryF is a single form.

Sorry for late response, been trying to fix my mower...

DoCmd.OpenForm actually opens a separate form instead of focusing on an existing form control.

Just to make sure that I wasn't leading you the wrong way, I built a quick form to test. In my form, I put a button  that simulates the same effect as double clicking your ID field. I named the button "OpenPlantFBtn", again, just so I had something to click to adjust a form on a separate tab. My 2 tabs are "Main Page" and "PlantF".

On the "PlantF" tab, I have a subform control named "SubPlantF" with the "PlantT" table, you would set the source to your "PlantEntryF" form. In my form, there is no need to link the child and master fields.

My generic PlantF table I created simply has a "PlantID" and a "PlantName" field.

If I open my form, it opens to the "Main Page" tab. If I click the tab for "PlantF", it will show the "SubPlantF" sub form with the "PlantF" table with all records.

If I click the "OpenPlantFBtn" on the Main Page tab, it switches to the "PlantF" tab and filters the table to the Plant with ID 2.

Code for "OpenPlantFBtn":
Private Sub OpenPlantFBtn_Click()
    SubPlantF.SetFocus
    SubPlantF.Form.RecordSource = "SELECT * FROM PlantF WHERE PlantID=2"
End Sub

In your case, you would just need to use similar code in your on double click event

Thank you so much for taking out the time to assist Donald. I will make the changes and try your recommendation. Have a blessed evening.