Dialog not appering in DB2, only the page is faded

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Please ignore again. After posting this, I started reading the discussion here: VueJs - where to store my data
And realized computed methods work the other way around, not how I wanted to use them, I need a watch method... changing the code now...

[30 minutes later]

OK, sorry, lost the plot again.
so I bing the combovox to a value using v-model:

            <v-combobox label="Presets"
              :items="['Today', 'Yesterday', 'Last 7 days', 'This week', 'Last Week', 'This Month', 'Last Month']"
              v-model="preset"></v-combobox>

And I include the this preset value in the data model:

  data() {
    return {
        dialogData:null,
        fromdatevalue: Date.now(),
        todatevalue: Date.now(),
        preset: ''
    }

And I create a watch function to handle when this is getting changed:

      preset: function() {
        console.log(preset);
        var today = new Date();
        this.fromdatevalue = today.toISOString().split('T')[0];
        this.todatevalue = new Date(today.getTime() + 24*60*60*1000).toISOString().split('T')[0];
      }

But how do I get what option was selected in the combobox?