title: p:calendar does not work
body: <p>I have a very strange problem regarding <code>&lt;p:calendar&gt;</code> component. I have a calendar in a <code>&lt;p:panelGrid&gt;</code> (see below), but when I open my page, calendar is not opened when clicked on a "input box" like it should.</p>
  
  <pre><code>&lt;p:panelGrid&gt;                           
      &lt;p:calendar value="#{backingBean.date}" /&gt;
  &lt;/p:panelGrid&gt;
  </code></pre>
  
  <p>Of course, date attribute is in my backing bean:</p>
  
  <pre><code>private Date date;
  
  public void setDate(Date date) {
      this.date = date;
  }
  
  public Date getDate() {
      return date;
  }
  </code></pre>
  
  <p>I just don't know what to do to make it work. One more thing: there are problems with a ~` too. Just cannot click on it to select value.</p>
  
  <p>PS: Using PF 5.1</p>