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Selection contains a component introduced in an ancestor

By : Wan Xin
Date : October 17 2020, 06:10 AM
this one helps. Ancestor, in this context, means a class in the chain of classes from wich the object under discussion inherits. For example look at TButton in help. At the top of the help page, all ancestors of TButton are shown as a chain of classes starting with TObject
Thus, the error message means that an ancestor class (ancestor of your selection) has declared the component you try to delete.
code :

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JList selection, successive items are marked as selected when popup is introduced in-between

By : dominique chaptal
Date : March 29 2020, 07:55 AM
I wish this help you I see that you are checking getValueIsAdjusting() in your ListSelectionListener, as shown here. You might try wrapping the call to changeTextArea() inside an Runnable using invokeLater().

find if my component is an ancestor of other component

By : kaidbz
Date : March 29 2020, 07:55 AM
wish helps you I implement , Are you looking for this?:
code :
SwingUtilities.getAncestorOfClass(JScrollPane.class, jtable);
SwingUtilities.isDescendingFrom(jtable, aParentOfJTable);

How to find out what version of Delphi a component was introduced?

By : amine60 _SBD
Date : March 29 2020, 07:55 AM
This might help you Source 1
I found this page with a Google search: http://www.blong.com/Conferences/BorCon2003/Actions/6102.htm

Delphi xe8, Cannot rename component xxx, component was introduced in an ancestor form

By : Jozef Barna
Date : March 29 2020, 07:55 AM
To fix this issue In Design view locate the Views: dropdown. Select 'Master' and you will be able to rename the components on the form.

check if a component is a child or ancestor of another component ReactJS

By : del
Date : March 29 2020, 07:55 AM
should help you out The parent can define a function in the context, Children can then call this function:
code :
childContextTypes: {
    notifyChange: React.PropTypes.func.isRequired

getChildContext () {
    return {
        notifyChange: (...args) => this.handleChange(...args)

handleChange (arg) {
    console.log(arg + ' bar!')
contextTypes: {
    notifyChange: React.PropTypes.func

handleSomething () {
    const { notifyChange } = this.context

    // safety check if component is used elsewhere
    if (notifyChange) notifyChange('foo!')
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