A Tabular Editor C# script to test/check any valid combination of selected columns and/or measures in the model.

PreviewColumnsAndMeasures.csx

// Instructions
// ------------
// 1. Save this script as a macro with a context of 'Column' and 'Measure'
// 2. Configure a keyboard shortcut for the macro (i.e. ALT + C) if using Tabular Editor 3
// 3. Select any combination of columns & measures related in the model & run the script
// 4. The output will show you the evaluation result for all selected objects, presuming evaluation is valid


// Get column names
var _ColumnsList = new List<string>();
foreach ( var _SelectedColumn in Selected.Columns )
{
    _ColumnsList.Add(_SelectedColumn.DaxObjectFullName);
}
string _Columns = String.Join(",", _ColumnsList );


// Get measure names
var _MeasuresList = new List<string>();
var _MeasuresOnlyList = new List<string>();
foreach ( var _SelectedMeasure in Selected.Measures )
{
    // Create a syntax for evaluating objects when measures + columns are selected
    _MeasuresList.Add( @"""@" + _SelectedMeasure.Name + @"""" );
    _MeasuresList.Add(_SelectedMeasure.DaxObjectFullName);

    // Create a syntax for evaluating objects when only measures are selected
    _MeasuresOnlyList.Add( 
        "\nADDCOLUMNS (\n{" + 
        @"""" + _SelectedMeasure.Name + @"""" + 
        "},\n" + 
        @"""" + "Result" + @"""" + 
        ",\n" + 
        _SelectedMeasure.DaxObjectFullName + ")");
}
string _Measures = String.Join(",", _MeasuresList );


// Results differ depending on how many columns, measures are selected
int _NrMeasures = Selected.Measures.Count();
int _NrColumns = Selected.Columns.Count();


// ----------------------------------------------------------------------------------------------------------//
// Result if a combination of measures and columns are selected
if ( _NrMeasures > 0 && _NrColumns > 0 )
{
    // Summarize selected columns + measures with DAX
    string _dax = 
        "SUMMARIZECOLUMNS ( " + _Columns + ", " + _Measures + ")";

    // Return output in pop-up
    EvaluateDax(_dax).Output();
}


// ----------------------------------------------------------------------------------------------------------//
// Result if no columns selected and more than one measure selected
else if ( _NrColumns == 0 && _NrMeasures > 1 )
{
    // Evaluate each measure as a separate row
    string _dax = 
        "SELECTCOLUMNS( UNION ( " +                    // SELECTCOLUMNS to re-name cols, UNION to combine rows
        String.Join(",", _MeasuresOnlyList ) + ")," +  // Concatenate list of measure evaluations
        @"""" + "Measure Name" + @"""" +               // Re-name first column as "Measure Name"
        ", [Value]," +                                 // 
        @"""" + "Measure Result" + @"""" +             // Re-name second column as "Measure Result"
        ", [Result])" ;                                // 

    // Return output in pop-up
    EvaluateDax(_dax).Output();
}


// ----------------------------------------------------------------------------------------------------------//
// Result if no columns selected and exactly one measure selected
else if ( _NrColumns == 0 && _NrMeasures == 1 )
{
    // Evaluate each measure as a separate row
    string _dax =                                      
        "SELECTCOLUMNS( " +                           // SELECTCOLUMNS to re-name cols
        String.Join(",", _MeasuresOnlyList ) + "," +  // Concatenate list of measure evaluations 
        @"""" + "Measure Name" + @"""" +              // Re-name first column as "Measure Name" 
        ", [Value]," +                                //  
        @"""" + "Measure Result" + @"""" +            // Re-name second column as "Measure Result"
        ", [Result])" ;                               // 

    // Return output in pop-up
    EvaluateDax(_dax).Output();
}


// ----------------------------------------------------------------------------------------------------------//
// Result if no measures and only columns are selected
else
{
    // Summarize selected columns with DAX
    string _dax = 
        "SUMMARIZECOLUMNS ( " + _Columns + ")";

    // Return output in pop-up
    EvaluateDax(_dax).Output();
}