Hi there,
I observe a strange behaviour in the paper-tabs ontap listener: When I 
register listeners on a "paper-tabs" menu, changing the tabs selection bar 
color, the color does not change on the first, but only on the second click 
on a tab. This means that the color change on the selection bar always lags 
exactly one click behind - so e.g. when I click on Tab-1 first, and then on 
Tab-2, the color change of Tab-1 is applied first and only after a second 
click on Tab-2, the correct Tab-2 specific color is applied.

For the menu itself I made a component like this which uses the 
{{selected}} variable to specify the currently selected tab:

<dom-module id="yosovo-menu">

<template>
    <paper-tabs id="my_menu" noink selected={{selected}}>
        <paper-tab id="tab1">Tab-1</paper-tab>
        <paper-tab id="tab2">Tab-2</paper-tab>
        <paper-tab id="tab3">Tab-3</paper-tab>
     </paper-tabs>
</template>

<script>
    My_Menu = Polymer({
        is: 'my-menu',

        properties: {
            selected: Number,
            value: 0
        },
        listeners:{
            'my_menu.tap': 'handleMenuTap'
        },
        handleMenuTap: function(e) {
            console.info("HandleMenuTap happened");
            console.info(this.selected);
            if(this.selected == 0){
                this.customStyle['--paper-tabs-selection-bar-color'] = 'red';
            }
            if(this.selected == 1){
                this.customStyle['--paper-tabs-selection-bar-color'] = 'blue';
            }
            if(this.selected == 2){
                this.customStyle['--paper-tabs-selection-bar-color'] = 'green';
            }
            this.updateStyles();
        }
    });

    var my_menu = new My_Menu();

  </script>

</dom-module>


In my index.html body, I call the menu like this:

<yosovo-menu selected=0></yosovo-menu>


I'm relatively new to Webcomponents and JavaScript in general. If you think 
that this is not the right approach at all, please also tell me. ;)

Thanks in advance!
Constantin

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