I solved the issue extending DropZone. This implementation receive as constructor param the target grid, and this, be in the rbar (docked control) of source grid. The key is set ddGroup to "header-dd-zone-" plus id from source grid. I hope this is useful.
Ext.define('Crud.FilterDropZone', {
extend: 'Ext.dd.DropZone'
, constructor: function() {}
, init: function (grid) {
var me = this;
if (grid.rendered) {
me.grid = grid;
me.ddGroup = 'header-dd-zone-' + grid.up('grid').id;
grid.getView().on({
render: function(v) {
me.view = v;
Crud.FilterDropZone.superclass.constructor.call(me, me.view.el);
},
single: true
});
} else {
grid.on('render', me.init, me, {single: true});
}
}
, getTargetFromEvent: function (e) {
return {};
}
, onNodeDrop: function (nodeData, source, e, data) {
var header = data.header
, store = Ext.getCmp(e.target.id).getStore();
//store.add(new store.RecordType({ property: header.text, value: '', reference: header.dataIndex}));
store.add([[header.text, '', header.dataIndex]]);
}
});