How to disable a particular row in Picker in Sencha touch

I have created a picker in Sencha touch 2.1. My Data is displaying properly. I want to disable a particular value not all so that if I select that value and click "doneButton" then it shouldn't be taken.

Example:

function loadPicker(paramName, valueSet) {
    Ext.Viewport.remove(Ext.getCmp(paramName + 'Pickerfield'), true);
    if (!paramName.picker) {
        paramName.picker = Ext.Viewport.add({
            xtype: 'picker',
            id: paramName + 'Pickerfield',
            useTitles: true,
            slots: [{
                name: paramName,
                title: paramName,
                data: valueSet
            }],

            doneButton: {
                listeners: {
                    tap: function(button, event, eOpts) {
                        var selectedPacingModeValue =
                            Ext.getCmp(paramName + 'Pickerfield').getValue()[paramName];
                        sendSetPendingRequest(paramName, selectedPacingModeValue);
                    }
                }
            }
        });
    }
}

lets take these are the values in my picker field. What I am doing on select of an value and click of "doneButton", I am showing the value in a textfield. What I want is if I will select "option 2" and click "doneButton" then option 2 shouldn't be displayed in textfield but for all other values this selecting and showing in textfield operation should work.

You can just get the selected record and check that flag upon click of the done button, then move to textbox (or not).

Ext.create('Ext.form.Panel', {
    fullscreen: true,
    items: [
        {
            xtype: 'fieldset',
            title: 'Select',
            items: [
                {
                    xtype: 'selectfield',
                    itemId: 'mySelectField',
                    label: 'Choose one',
                    options: [
                        {
                            text: 'apple',
                            value: 50
                        }, {
                            text: 'orange',
                            value: 100,
                            disabled: true
                        }, {
                            text: 'banana',
                            value: 200
                        }, {
                            text: 'papaya',
                            value: 300
                        }
                    ]
                },
                {
                    xtype: 'button',
                    text: 'done',
                    handler: function(button){
                        var panel = button.up(),
                            sf = panel.down('#mySelectField'),
                            tf = panel.down('#answerfield');

                        /* you can only access the raw value unless you use
                         * an actual store and an actual model with the 
                         * disabled field. In that case you can do
                         * sf.getRecord().get('disabled')
                         */ 
                        if(sf.getRecord().raw.disabled === true){
                            tf.setValue(''); //noting to see :)
                        } else {
                            tf.setValue(sf.getRecord().get('text')); //display value
                        }
                    }
                },
                {
                    xtype: 'textfield',
                    itemId: 'answerfield',
                    title: 'answer'
                }
            ]
        }
    ]
});

Working fiddle: http://www.senchafiddle.com/#d46XZ

UPDATE Like you asked: with the picker

Ext.Loader.setConfig({
    enabled: true
});

Ext.application({
    name: 'SenchaFiddle',

    launch: function() {
        var picker = Ext.create('Ext.Picker', {
            slots: [
                {
                    name : 'stuff',
                    title: 'Stuff',
                    data : [
                        {
                            text: 'apple',
                            value: 50
                        }, {
                            text: 'orange',
                            value: 100,
                            disabled: true
                        }, {
                            text: 'banana',
                            value: 200
                        }, {
                            text: 'papaya',
                            value: 300
                        }
                    ]
                }
            ],
            listeners: {
                change: function(p, value){
                    var tf = panel.down('#answerfield'),
                        firstSlot = p.getItems().get(1), //index 0 is the toolbar 1 first slot and so on..
                        selectedRecord = firstSlot.getData()[firstSlot.selectedIndex];
                    if(selectedRecord.disabled === true){
                        tf.setValue(''); //noting to see :)
                    } else {
                        console.log(selectedRecord);
                        tf.setValue(selectedRecord.text); //display value
                    }
                }
            }
        });
        var panel = Ext.create('Ext.form.Panel', {
            fullscreen: true,
            items: [
                {
                    xtype: 'fieldset',
                    title: 'Select',
                    items: [
                        {
                            xtype: 'button',
                            text: 'show picker',
                            handler: function(button){
                                Ext.Viewport.add(picker);
                                picker.show();
                            }
                        },
                        {
                            xtype: 'textfield',
                            itemId: 'answerfield',
                            title: 'answer'
                        }
                    ]
                }
            ]
        });


    }
});

working fiddle: http://www.senchafiddle.com/#SFgpV