ListObjects and Table's cell column - Insert records by column name [VBA]

[iliomil]

Good evening everyone.
I need your help building an "Insert" click event routine via command button.

• I have a Structured table called "myTable" with a variable number of columns (they represent the names of the districts);
• The Header Range has the name "DistrictHeaderRange";
• I have a form with 4 controls: 1 combobox, 1 textbox, 1 listbox, 1 command button.

In my other tables, I used routine like this to insert new records into worksheets:

 ActiveSheet.ListObjects("myTable").ListRows.Add

Routine works fine, apart not insert value in first empty cells but writing directly to the first available row after the last record.
Is it possible to build a routine that writes a value (Washington) from TextBox1 in the first empty cell of the column (District of Columbia ) chosen through ComboBox1?
I would like to choose the district from ComboBox1 and insert a new city (therefore dependent on the district) and store it in the Excel sheet in vertical.
I made several attempts but I gave up.
Thank you for your help

 

[iliomil]

Table's structure. Just two columns for now

 

[iliomil]

Update:
If it can help, I share the link to my Dropbox to download the Sample_Table_MrExcel
Thanks to anyone.